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Hi, I need some advice on my new spark gap rotor construction. The rotor is 5/8" G10 Fr4, 10" in diameter. I have .5" x 2.25" Tungsten on hand for this. I would like to use 4 or 8 electrodes. I also have an 18" x 18" in 5/8". This will probably run async @ ~ 400 BPS. Here are the questions: 1. What is a recommended bore to press in .5" W . 2. How far should the center of the electrodes be placed from the edge of the disk for a good margin of strength? 3. I remember a list member suggesting angling in the set screws from the outside edge to help improve strength. If no one present has a good handle on this, who would be a good source to contact on disk rotor construction? I have been off list for some time. Thanks Much, Jim Mora _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla